Expansion of (1-x)^(-1)/(1+2*x+x^2+x^3).

Terms

a(0) =1a(1) =-1a(2) =2a(3) =-3a(4) =6a(5) =-10a(6) =18a(7) =-31a(8) =55a(9) =-96a(10) =169a(11) =-296a(12) =520a(13) =-912a(14) =1601a(15) =-2809a(16) =4930a(17) =-8651a(18) =15182a(19) =-26642a(20) =46754a(21) =-82047a(22) =143983a(23) =-252672a(24) =443409a(25) =-778128a(26) =1365520a(27) =-2396320a(28) =4205249a(29) =-7379697